Cisco SPA100 Series Analog Telephone Adapters Remote Code Execution Vulnerabilities

Vulnerability

Multiple vulnerabilities exist in the web-based management interface of Cisco SPA100 Series Analog Telephone Adapters (ATAs) due to improper validation of user-supplied input. The affected firmware versions are those prior to the fixed releases provided in Cisco's security advisory [1]. The web-based management interface is enabled by default, making the attack surface readily accessible to authenticated users on the same network segment.

Exploitation

An attacker must first authenticate to the web-based management interface of an affected device. After successful authentication, the attacker sends crafted HTTP requests to the device, exploiting the input validation flaws to trigger arbitrary code execution. The attacker must be on the same adjacent network as the target device; no additional user interaction is required beyond the initial authentication [1].

Impact

Successful exploitation allows the attacker to execute arbitrary code with elevated privileges on the affected device. This can lead to full compromise of the ATA, including potential disclosure of sensitive information, modification of device configuration, and disruption of telephony services. The elevated privileges grant the attacker control over the device's operating system [1].

Mitigation

Cisco has released free firmware updates to address these vulnerabilities. Affected users should upgrade to the fixed firmware versions as specified in the Cisco Security Advisory [1]. No workarounds are available; the only mitigation is applying the update. The advisory does not indicate that these vulnerabilities are listed in the Known Exploited Vulnerabilities (KEV) catalog.